WO2023166798A1

WO2023166798A1 - Light-emitting device and display device

Info

Publication number: WO2023166798A1
Application number: PCT/JP2022/043462
Authority: WO
Inventors: 慎赤阪; 宗也荒木
Original assignee: ソニーグループ株式会社
Priority date: 2022-03-03
Filing date: 2022-11-25
Publication date: 2023-09-07
Also published as: TW202337049A

Abstract

Provided is a light-emitting device that is lighter-weight but still achieves excellent light-emission performance. According to the present invention, a light source device has a plurality of light source units and a relay member. The plurality of light source units each have a light source substrate that extends in a first direction and a plurality of light sources that are arranged on the light source substrate along the first direction. The relay member is electrically connected to each of the plurality of light source units.

Description

Light emitting device and display device

The present disclosure relates to a light-emitting device suitable for a surface light source and a display device that displays an image using illumination light from the light-emitting device.

Until now, light source devices using LEDs (Light Emitting Diodes) as light sources have been used, for example, as backlights for liquid crystal display devices (see

Patent Documents

1 and 2, for example).

JP 2012-203997 A International Publication No. 2020-039721

By the way, recently, there is a demand for a light-emitting device capable of realizing a more precise light emission luminance distribution by highly integrating a plurality of light sources.

Therefore, a light-emitting device capable of exhibiting excellent light-emitting performance and a display device including the same are desired.

A light emitting device as an embodiment of the present disclosure has a plurality of light source units and a relay member. The plurality of light source units each have a light source substrate extending in the first direction and a plurality of light sources arranged along the first direction on the light source substrate. The relay member is electrically connected to each of the plurality of light source units.

In the light emitting device as an embodiment of the present disclosure, the arrangement position of each light source unit can be finely adjusted, so the arrangement position of each light source can be easily optimized. It is also advantageous for weight reduction.

1 is a first perspective view showing a state in which a light emitting device according to a first embodiment of the present disclosure is viewed from a first direction; FIG. FIG. 1B is a second perspective view showing a state in which the light emitting device shown in FIG. 1A is viewed from a second direction; 2 is a plan view showing a planar configuration of the light emitting device shown in FIG. 1; FIG. 2 is a cross-sectional view showing a cross-sectional configuration of part of the light emitting device shown in FIG. 1; FIG. 2 is an enlarged cross-sectional view showing one configuration example of the light source shown in FIG. 1; FIG. 2 is an enlarged cross-sectional view showing one configuration example of the wavelength conversion sheet shown in FIG. 1. FIG. It is a top view which shows one structural example of the light source device which concerns on the 1st modification of 1st Embodiment. FIG. 7 is a perspective view showing the appearance of a display device according to a second embodiment of the present disclosure; 8 is an exploded perspective view of the main body shown in FIG. 7; FIG. 9 is an exploded perspective view of the panel module shown in FIG. 8. FIG. FIG. 9 is a schematic plan view showing a planar configuration example of the panel module shown in FIG. 8 ; It is a plane schematic diagram showing the plane structural example of the panel module based on the 1st modification of 2nd Embodiment. It is a schematic plan view showing a planar configuration example of a panel module according to a second modification of the second embodiment. It is a schematic plan view showing a planar configuration example of a panel module according to a third modification of the second embodiment. FIG. 11 is a cross-sectional view showing a configuration example of a light-emitting device according to another first modified example of the present disclosure; FIG. 11 is a cross-sectional view showing a configuration example of a light-emitting device according to another second modified example of the present disclosure; FIG. 11 is a cross-sectional view showing a configuration example of a light-emitting device according to another third modified example of the present disclosure; FIG. 21 is a cross-sectional view showing a configuration example of a light-emitting device according to another fourth modified example of the present disclosure; FIG. 20 is a cross-sectional view showing a configuration example of a light-emitting device according to another fifth modified example of the present disclosure; FIG. 21 is a cross-sectional view showing a configuration example of a light emitting device according to another sixth modified example of the present disclosure; FIG. 21 is a cross-sectional view showing a configuration example of a light-emitting device according to another seventh modified example of the present disclosure; 21 is a cross-sectional view showing the detailed configuration of a conductive material layer of the light emitting device shown in FIG. 20; FIG. FIG. 22 is a first cross-sectional view showing the formation process of the conductive material layer shown in FIG. 21; FIG. 22 is a second cross-sectional view showing the formation process of the conductive material layer shown in FIG. 21; FIG. 22 is a third cross-sectional view showing the formation process of the conductive material layer shown in FIG. 21; 21 is a cross-sectional view showing the detailed configuration of a conductive material layer as a first modification of the light emitting device shown in FIG. 20; FIG. FIG. 24 is a first cross-sectional view showing the formation process of the conductive material layer shown in FIG. 23; FIG. 24 is a second cross-sectional view showing the formation process of the conductive material layer shown in FIG. 23; 24 is a third cross-sectional view showing the formation process of the conductive material layer shown in FIG. 23; FIG. 21 is a cross-sectional view showing a detailed configuration of a conductive material layer as a second modification of the light emitting device shown in FIG. 20; FIG. FIG. 26 is a schematic plan view schematically showing an example of the positional relationship between the bumps and the exposed portions of the wirings of each light emitting device shown in FIGS. 23 and 25; FIG. 21 is a cross-sectional view showing a configuration example of a light-emitting device according to another eighth modification of the present disclosure; FIG. 21 is a cross-sectional view showing a configuration example of a display device according to another ninth modification of the present disclosure;

Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. The description will be given in the following order.
1. First Embodiment (Light Emitting Device)
2. Second Embodiment (Liquid Crystal Display Device)
3. Other variations

<1. First Embodiment>
[1.1 Configuration]
1A and 1B are perspective views each showing a configuration example of the light emitting device 100 according to the first embodiment of the present disclosure. 1A and 1B show how the light emitting device 100 is viewed from opposite directions. FIG. 2 is a plan view showing a planar configuration example of the light emitting device 100 shown in FIG. Furthermore, FIG. 3 is an enlarged cross-sectional view showing a cross-sectional configuration example of part of the light emitting device 100 shown in FIG. Note that FIG. 3 shows a cross section in the arrow direction along the III-III section line shown in FIG. The light emitting device 100 is suitable as a surface light source, and is used, for example, as a direct type backlight mounted on a liquid crystal display device.

The light emitting device 100 has, for example, a plurality of light source units 10, a relay substrate 20, and a flexible film 30. The plurality of light source units 10 each extend in the X-axis direction and are arranged side by side in the Y-axis direction. On the other hand, the relay board 20 extends, for example, in the Y-axis direction and is mechanically joined to each of the plurality of light source units 10 . The relay board 20 is also electrically connected to each of the plurality of light source units 10 by the plurality of connection portions 50 .

In this embodiment, the longitudinal direction of the light source unit 10 is the X-axis direction, the lateral direction of the light source unit 10 is the Y-axis direction, and the thickness direction of the light source unit 10 is the Z-axis direction. The X-axis direction, Y-axis direction, and Z-axis direction are orthogonal to each other.

As shown in FIG. 1A, each light source unit 10 has a light source board 1 and a plurality of light sources 2 . As shown in FIG. 3, the light source substrate 1 has a front surface 1FS and a back surface 1BS opposite to the front surface 1FS in the thickness direction (Z-axis direction). A plurality of light sources 2 are provided on the surface 1FS of the light source substrate 1 (FIG. 3). The plurality of light sources 2 are arranged in, for example, one row at predetermined intervals along the X-axis direction, which is the longitudinal direction of the light source substrate 1 . The flexible film 30 extends along the XY plane and is provided on the surface 1FS side of the light source substrate 1 so as to cover the entire plurality of light source units 10 . The plurality of light source units 10 may be fixed to the flexible film 30 by, for example, adhesion. The relay substrate 20 is provided on the rear surface 1BS side of the light source substrate 1 .

The light emitting device 100 has a drive element 40 as shown in FIG. The drive element 40 may be provided, for example, on the light source substrate 1 of each light source unit 10 or may be provided on the relay substrate 20 . The light emitting device 100 may further include a spacer 6, a diffusion sheet 7, a wavelength conversion sheet 8, and an optical sheet group 9, as shown in FIG.

(Light source unit 10)
As shown in FIGS. 1A, 1B, and 2, the plurality of light source units 10 are preferably arranged along the Y-axis direction, for example, spaced apart from each other. In particular, as shown in FIG. 2, the width W1, which is the dimension in the Y-axis direction of each light source unit 10, is preferably narrower than the interval W2 between the adjacent light source units 10. As shown in FIG. This is because the materials used for the light source substrate 1 and the like can be reduced, and the weight can be reduced. 1A, 1B, and 2, eight light source units 10 are connected to one relay board 20, but the present disclosure is not limited to this. Seven or less light source units 10 may be connected to one relay board 20, or nine or more light source units 10 may be connected.

The light source unit 10 has a light source substrate 1, a plurality of light sources 2, wiring 4 and an insulating layer 4Z, and a resin layer 5, as shown in FIG. The light source substrate 1 is, for example, an electrically insulating film-like member made of resin, and preferably has flexibility. The light source substrate 1 is made of, for example, PI (polyimide), PET (polyethylene terephthalate), PC (polycarbonate), PEN (polyethylene naphthalate), PEI (polyetherimide), LCP (liquid crystal polymer), or resin made of fluorine resin. film can be used. Alternatively, as the light source substrate 1, a metal base substrate such as aluminum (Al) having an insulating resin layer such as polyimide or epoxy formed on the surface thereof may be used. Furthermore, as the light source substrate 1, a film substrate made of a glass-containing resin such as a glass epoxy resin typified by FR4 or a glass composite resin typified by CEM3 may be used. A plurality of wirings 4 provided on an insulating layer 4Z and a plurality of light sources 2 are mounted on the surface 1FS of the light source substrate 1 . A plurality of wirings 51 are formed on the back surface 1BS of the light source substrate 1 . The plurality of wirings 51 are electrically connected to the wirings 4 via vias 10V, for example. The via 10V can be formed by, for example, forming a via hole by selectively digging a predetermined region of the back surface 1BS of the light source substrate 1 by laser processing, and then filling the via hole with a conductive material. At that time, the wiring 4 formed on the surface 1FS serves as an etching stopper.

(Light source 2 and wiring 4)
A plurality of light sources 2 are provided on the surface 1FS of the light source substrate 1 . As described above, the plurality of light sources 2 are arranged in a row at predetermined intervals along the X-axis direction, which is the extending direction of the light source substrate 1, as shown in FIG. Note that the intervals between the plurality of light sources 2 are not limited to being constant, and can be arbitrarily set as desired. Further, in one light source substrate 1, a plurality of rows of the light sources 2 arranged in the X-axis direction may be arranged in a plurality of rows adjacent to each other in the Y-axis direction. A plurality of wirings 4 having a predetermined pattern shape are formed on the surface 1FS of the light source substrate 1 so as to enable independent light emission control for each of one or more light sources 2 . A plurality of wirings 4 enables local light emission control (local dimming) of a plurality of light sources 2 . In the light emitting device 100, the drive element 40 controls the light emission intensity and lighting timing for each unit area A (AL, AC, AR) indicated by broken lines in FIG. 2, for example. The drive element 40 is a drive IC that drives each light source 2, that is, turns it on and off. The drive element 40 is preferably provided on at least one of the relay board 20 and the light source board 1 . In the configuration example of FIG. 2, the light source substrate 1 is provided with one driving element 40L and one driving element 40R, and the relay substrate 20 is provided with the driving element 40C. In the configuration example of FIG. 2, the light source 2 provided in the unit area AL is connected to the driving element 40L through the wiring 4, the light source 2 provided in the unit area AC is connected to the driving element 40C through the wiring 4, and the unit area AR A light source 2 is connected to the driving element 40R by a wiring 4. The drive element 40L drives, for example, three light sources 2 provided in the unit area AL among the plurality of light sources 2 provided on the light source substrate 1 . The drive element 40</b>C drives, for example, three light sources 2 provided in the unit area AC among the plurality of light sources 2 provided on the light source substrate 1 . The driving element 40</b>R drives, for example, three light sources 2 provided in the unit area AR among the plurality of light sources 2 provided on the light source substrate 1 . Further, in the example shown in FIG. 2, three light sources 2 are arranged in one unit area A, but the present disclosure is not limited to this. The number of light sources 2 included in one unit area A may be one, two, or four or more.

The wiring 4 is patterned using a photolithographic method after, for example, copper foil is pasted on the light source substrate 1 . Alternatively, the wiring 4 may be patterned using photolithography after forming a metal film on the light source substrate 1 using plating or vacuum film forming technology. Furthermore, the wiring 4 may be formed by a printing method such as screen printing or an inkjet method. Examples of the constituent material of the wiring 4 include copper (Cu), aluminum (Al), silver (Ag), and alloys thereof.

(Resin layer 5)
The resin layer 5 is, for example, a white resist layer. The resin layer 5 has a relatively high reflectance with respect to light from the light source 2 and light wavelength-converted by the wavelength conversion sheet 8 . Examples of white resist include inorganic materials such as titanium oxide (TiO ₂ ) fine particles and barium sulfate (BaSO ₄ ) fine particles, and organic materials such as porous acrylic resin fine particles and polycarbonate resin fine particles having countless pores for light scattering. is mentioned. As a constituent material of the resin layer 5, an epoxy-based resin can also be used. Furthermore, the resin layer 5 may be made of resin containing fine particles of an inorganic material such as titanium oxide (TiO ₂ ) fine particles or barium sulfate (BaSO ₄ ) fine particles. A flexible film 30 is adhered to an area of the surface of the resin layer 5 other than the area where the light source 2 is provided.

(Details of light source 2)
FIG. 4 is an enlarged sectional view showing one configuration example of the light source 2 shown in FIG. However, FIG. 4 also shows the flexible film 30 . As shown in FIG. 4 , the light source 2 is a so-called direct potting light source, and has a light emitting element 21 and a sealing lens 22 . The light-emitting element 21 has, for example, a semiconductor layer 23 containing a light-emitting body, and a reflective layer 25 arranged so as to face the semiconductor layer 23 and the transparent layer 24 in the Z-axis direction.

The transparent layer 24 is made of, for example, sapphire or silicon carbide (SiC). The semiconductor layer 23 has, for example, an n-type semiconductor layer, an active layer, and a p-type semiconductor layer stacked in this order from the transparent layer 24 side. The n-type semiconductor layer is composed of, for example, an n-type nitride semiconductor (for example, n-type GaN). The active layer is composed of, for example, a nitride semiconductor (eg, n-type GaN) having a quantum well structure. The p-type semiconductor layer is composed of, for example, a p-type nitride semiconductor (eg, p-type GaN). The semiconductor layer 23 is composed of, for example, a blue LED (Light Emitting Diode) that emits blue light (for example, a wavelength of 440 nm to 460 nm). The reflective layer 25 is provided on the surface of the transparent layer 24 opposite to the semiconductor layer 23 . The reflective layer 25 is made of a material with high reflectance. The reflective layer 25 is specifically composed of a silver vapor deposition film, an aluminum vapor deposition film, a multi-layer reflective film, or the like. Examples of multilayer reflective films include DBRs (Distributed Bragg Reflectors).

As shown in FIG. 4, in the light emitting element 21, the light LB emitted from the active layer of the semiconductor layer 23 is reflected by the reflective layer 25 and then enters the sealing lens 22 through the end surface 24T of the transparent layer 24. . The light LB entering the sealing lens 22 is transmitted through the sealing lens 22 and emitted to the surroundings. Note that the light LB is subjected to an optical action when passing through the sealing lens 22 .

The sealing lens 22 is an optical member made of transparent resin such as silicone or acrylic. The sealing lens 22 is configured to cover the entire light emitting element 21 and seal the light emitting element 21 . The sealing lens 22 has a refractive index between the refractive index of the semiconductor layer 23 of the light emitting element 21 and the refractive index of air. The sealing lens 22 protects the light emitting element 21 and improves the extraction efficiency of light emitted from the light emitting element 21 . The outer shape of the sealing lens 22 is not particularly limited as long as it has an optical effect as a lens for taking out the light LB emitted from the light emitting element 21 . For example, the external shape of the sealing lens 22 is not limited to a shape including a spherical surface, and may be a shape including an aspherical surface. Moreover, the light distribution direction of the light LB emitted from the light emitting element 21 may be controlled by the sealing lens 22 .

Since the light source 2 has a direct potting structure, it is easy to form the sealing lens 22 into a dome shape with an aspect ratio of 0.2 or more and 1 or less. Concerning the shape of the sealing lens 22, especially if it is a dome shape within the range of 0.4 to 0.6, luminance uniformity characteristics such as luminance unevenness are improved. Here, the aspect ratio is h/r, which is the ratio of the height h to the radius r of the dome-shaped lens. When the aspect ratio is 1, it becomes a hemispherical shape.

(Wavelength conversion sheet 8)
The wavelength conversion sheet 8 is arranged so as to face the plurality of light sources 2 . FIG. 5 is an enlarged sectional view showing an enlarged part of the wavelength conversion sheet 8 shown in FIG. As shown in FIG. 5, the wavelength conversion sheet 8 contains, for example, a particulate wavelength conversion substance 81 . The wavelength conversion substance 81 includes, for example, a fluorescent substance (fluorescent substance) such as a fluorescent pigment or a fluorescent dye, or a quantum dot. It wavelength-converts light into light with a different wavelength from the original wavelength and emits it. In FIG. 5, the wavelength conversion substance 81 is drawn in a particulate form for the sake of simplicity, but the present disclosure is not limited to the wavelength conversion substance 81 in a particulate form.

The wavelength conversion material 81 contained in the wavelength conversion sheet 8 absorbs the blue light emitted from the light source 2 and converts part of it into red light (eg, wavelengths of 620 nm to 750 nm) or green light (eg, wavelengths of 495 nm to 570 nm). In this case, when the light from the light source 2 passes through the wavelength conversion sheet 8, red, green and blue lights are combined to generate white light. Alternatively, the wavelength conversion substance 81 contained in the wavelength conversion sheet 8 may absorb blue light and partially convert it into yellow light. In this case, when the light from the light source 2 passes through the wavelength conversion sheet 8, yellow and blue lights are combined to generate white light.

The wavelength conversion substance 81 contained in the wavelength conversion sheet 8 preferably contains quantum dots. A quantum dot is a particle with a long diameter of about 1 nm to 100 nm and has discrete energy levels. Since the energy state of a quantum dot depends on its size, it is possible to freely select the emission wavelength by changing the size. In addition, the emitted light of quantum dots has a narrow spectrum width. Combining light with such steep peaks expands the color gamut. Therefore, by using quantum dots as wavelength conversion substances, it is possible to easily expand the color gamut. Furthermore, quantum dots have high responsiveness, and the light from the light source 2 can be used efficiently. In addition, quantum dots are also highly stable. Quantum dots are, for example, compounds of Group 12 elements and Group 16 elements, compounds of Group 13 elements and Group 16 elements, or compounds of Group 14 elements and Group 16 elements, such as CdSe, CdTe, ZnS, CdS , PbS, PbSe or CdHgTe. In addition, there is a demand for Cd-free quantum dots due to environmental regulations such as RoHS regulations, and core materials include InP, perovskite CsPbBr3, Zn (Te, Se), and one of the I-III-VI group ternary systems. There is one of silver indium sulfide.

(Diffusion sheet 7)
The diffusion sheet 7 is an optical member arranged between the wavelength conversion sheet 8 and the multiple light sources 2 . The diffusion sheet 7 is for uniformizing the angular distribution of incident light. The diffusion sheet 7 may be one diffusion plate or one diffusion sheet, or two or more diffusion plates or two or more diffusion sheets. Also, the diffusion sheet 7 may be a plate-shaped optical member having a constant thickness and a constant hardness.

(Spacer 6)
A spacer 6 is a member for maintaining an optical distance between the light source 2 and the diffusion sheet 7 .

(Optical sheet group 9)
The optical sheet group 9 is an optical member arranged on the light exit surface side of the wavelength conversion sheet 8 , that is, on the side opposite to the diffusion sheet 7 when viewed from the wavelength conversion sheet 8 . The optical sheet group 9 includes, for example, a sheet or film for improving brightness. In the example shown in FIG. 1, the optical sheet group 9 is obtained by laminating an optical sheet 91 and an optical sheet 92 on the wavelength conversion sheet 8 in this order. The optical sheet 91 and the optical sheet 92 may be joined together and integrated. The optical sheet 91 is, for example, a prism sheet. The optical sheet 92 is, for example, a reflective polarizing film such as DBEF (Dual Brightness Enhancement Film). The number of optical sheets forming the optical sheet group 9 and the types and stacking order of the plurality of optical sheets forming the optical sheet group 9 can be arbitrarily selected.

(Flexible film 30)
A flexible film 30 is selectively provided on the resin layer 5 . More specifically, the flexible film 30 is provided in a region of the surface 1FS other than the region where the plurality of light sources 2 are provided. The flexible film 30 is provided with openings 30K in regions overlapping the plurality of light sources 2 in the Z-axis direction. The opening 30K is a hole for arranging the light source 2. The resin layer 5 is exposed in the area where the opening 30K is formed, and the exposed resin layer 5 is covered with the sealing lens 22 of the light source 2. state. The flexible film 30 is bonded to the surface of the resin layer 5 extending on the XY plane. Specifically, it is fixed by an adhesive or the like. The flexible film 30 is, for example, a reflective sheet, and has high reflectance with respect to, for example, the light LB from the light source 2 and the light LY wavelength-converted by the wavelength conversion sheet 8 . The flexible film 30 may contain titanium oxide or Ag (silver) as materials having high reflectance. The flexible film 30 is specifically a white resist layer, for example. Examples of white resist include inorganic materials such as titanium oxide (TiO ₂ ) fine particles and barium sulfate (BaSO ₄ ) fine particles, and organic materials such as porous acrylic resin fine particles and polycarbonate resin fine particles having countless pores for light scattering. is mentioned. Epoxy-based resin may also be used as the constituent material of the flexible film 30 . Furthermore, the flexible film 30 may be made of a resin containing fine particles of an inorganic material such as titanium oxide (TiO ₂ ) fine particles or barium sulfate (BaSO ₄ ) fine particles.

As described above, since the flexible film 30 is a reflective sheet, the return light reflected by the wavelength conversion sheet 8 and the optical sheet group 9 among the lights LB and LY is reflected by the flexible film 30. Used as recycled light to generate white light. Therefore, the brightness of the light emitting device 100 as a whole can be improved.

(Relay board 20)
The relay board 20 is a member that electrically and mechanically connects the plurality of light source units 10 and performs relay between the plurality of light source units 10 and a power supply circuit, a drive circuit, and the like. The relay board 20 may be made of a flexible film member, for example, like the light source board 1 . As a constituent material of the relay substrate 20, the same material as that of the light source substrate 1 can be used. That is, the relay substrate 20 is made of, for example, PI (polyimide), PET (polyethylene terephthalate), PC (polycarbonate), PEN (polyethylene naphthalate), PEI (polyetherimide), LCP (liquid crystal polymer), or fluorine resin. Any resin film can be used. Alternatively, as the relay substrate 20, a metal base substrate such as aluminum (Al) having an insulating resin layer such as polyimide or epoxy formed on the surface thereof may be used. Further, as the relay substrate 20, a film base material made of a glass-containing resin such as a glass epoxy resin typified by FR4 or a glass composite resin typified by CEM3 may be used. A plurality of wirings 52 are formed on the surface of the relay substrate 20 , that is, the surface facing the light source substrate 1 . A plurality of wirings 53 are formed on the rear surface of the relay substrate 20 , that is, the surface opposite to the light source substrate 1 . The wiring 52 and the wiring 53 are electrically connected to each other through the via 20V, for example.

Also, the relay board 20 is joined to each of the plurality of light source units 10 via the conductive material layer 54 . Specifically, for example, the wiring 51 and the wiring 52 facing each other are joined so as to sandwich the conductive material layer 54 . The plurality of light source units 10 and the relay board 20 are preferably bonded to each other at a plurality of locations via the conductive material layers 54 . This is because each light source unit 10 and the relay board 20 are connected to each other at multiple points, so that each light source unit is held more stably with respect to the relay board 20 . Further, since a plurality of channels such as signal transmission paths and power supply paths between each light source unit 10 and the relay board 20 can be secured, more functions can be provided. As the constituent material of the conductive material layer 54, for example, a conductive paste and solder, or an anisotropic conductive adhesive (ACA) is preferably used.

[1.2 Action]
In the light-emitting device 100 of the present embodiment, as shown in FIG. 3, part of the blue light LB emitted from the light source 2 is wavelength-converted (light-emitted) by the wavelength-converting substance contained in the wavelength-converting sheet 8. becomes light LY. The wavelength-converted light LY is, for example, red light and green light, or yellow light. The wavelength-converted light LY is reflected uniformly in all directions on average from the wavelength conversion sheet 8 and emitted. Of the blue light LB emitted from the light source 2, the blue light LB that is not absorbed by the wavelength conversion material 81 is also emitted uniformly in all directions from the wavelength conversion sheet 8 on average. Of the blue light LB emitted from the light source 2, the blue light LB that is not absorbed by the wavelength conversion material 81 (FIG. 5) is emitted from the wavelength conversion sheet 8 as it is. The forward light of the blue light LB that has not been wavelength-converted and the forward light of the wavelength-converted light LY are synthesized to generate white light, which is emitted forward (outside the light source device). .

In the light emitting device 100 of the present embodiment, a plurality of light source units each having a plurality of light sources are connected to one relay substrate 20 . Therefore, the arrangement position can be finely adjusted for each of the plurality of light source units 10, so that the arrangement position of each light source 2 can be easily optimized. It is also advantageous in reducing the weight of the light emitting device 100 . That is, by connecting a plurality of light source units 10 with one relay board 20, a plurality of light sources 2 are provided compared to a configuration in which a plurality of light sources are arranged on, for example, one board-shaped board. At the same time, the amount of material used for the light source substrate 1 can be reduced, and weight reduction and cost reduction can be achieved. Therefore, according to the light-emitting device 100, it is possible to realize a high-definition light emission luminance distribution while reducing weight and cost.

In the light emitting device 100 of the present embodiment, a plurality of light source units 10 are arranged along the Y-axis direction while being spaced apart from each other. Therefore, compared to a configuration in which a plurality of light sources 2 are arranged on one board-shaped light source substrate, the amount of material used for the light source substrate 1 can be reduced while having a plurality of light sources 2. Weight reduction and cost reduction can be achieved.

Further, in the light emitting device 100 of the present embodiment, if the width W1 of the light source unit 10 in the Y-axis direction is made narrower than the interval W2 between the plurality of light source units 10 adjacent to each other in the Y-axis direction, the light emitting device When arranging a predetermined number of light sources 2 in the entire 100, compared to the case where the width W1 is equal to or greater than the interval W2, the amount of material used for the light source substrate 1 can be further reduced, further reducing weight and cost. can be planned.

Also, in the light emitting device 100 of the present embodiment, the plurality of light sources 2 are arranged in a line along the X-axis direction on the light source substrate 1 . For this reason, when arranging a predetermined number of light sources 2 in the light emitting device 100 as a whole, the amount of material used for the light source substrate 1 can be further reduced compared to, for example, the case where the light sources 2 are arranged in a plurality of rows. Cost can be reduced.

Further, in the light emitting device 100, the plurality of light source units 10 and the relay board 20 are joined together with the conductive material layer 54 interposed therebetween. For this reason, compared to the case of joining via a connector, for example, the connection portions between the plurality of light source units 10 and the relay board 20 can be simplified, made smaller, thinner, and lighter. Therefore, compared with the case of using a connector, each light source unit 10 can be miniaturized, and the number of light sources 2 per unit area can be increased. That is, high integration of the plurality of light sources 2 can be realized. Moreover, compared with the case of using a connector, the easiness of manufacture is also improved. In particular, in the light emitting device 100, the plurality of light source units 10 and the relay substrate 20 are joined together at a plurality of locations by the conductive material layers 54, respectively. By connecting the plurality of light source units 10 and the relay board 20 at multiple points in this way, the plurality of light source units 10 are more stably held with respect to the relay board 20 . In addition, since a plurality of channels such as signal transmission paths and power supply paths between each light source unit 10 and the relay substrate 20 can be secured, the light emitting device 100 can have more functions.

Further, in the light emitting device 100, the light source substrate 1 is flexible, or both the light source substrate 1 and the relay substrate 20 are flexible. It can be used preferably.

Also, in the light emitting device 100, a plurality of light source units 10 are fixed by one flexible film 30 and integrated. For this reason, for example, the handling of the semi-finished product during the manufacturing process becomes easy, and for example, the work of bonding the plurality of light source units 10 to the relay substrate 20 can be performed collectively, thereby improving the ease of manufacture.

In addition, in the light emitting device 100, the flexible film 30 is bonded to the surface of the resin layer 5 of the light source unit 10, which faces the XY plane. Therefore, the plurality of light source units 10 are held more stably with respect to the flexible film 30 .

Also, in the light emitting device 100, the flexible film 30 has an opening 30K in a region overlapping the light source 2 in the Z-axis direction. Therefore, even when the flexible film 30 is arranged on the light emitting side of the light source 2, it is possible to join the plurality of light source units 10 while avoiding the area where the light source 2 exists. Therefore, it is possible to prevent the flexible film 30 from hindering the progress of the emitted light.

Further, in the light emitting device 100 , driving elements for driving the plurality of light sources 2 are provided on at least one of the relay substrate 20 and the light source substrate 1 . Therefore, compared to the case where the drive element 40 is provided outside the light emitting device 100, the plurality of light sources 2 can be driven at a higher speed. In particular, the driving element 40 is provided on the light source substrate 1, and among the plurality of light sources 2 provided on the light source substrate 1, some of the light sources 2 near the driving element 40 are driven. 2 can be further enhanced.

[1.3 Effect]
As described above, according to the light-emitting device 100 of the present embodiment, it is possible to exhibit excellent light-emitting performance while arranging a plurality of light sources at a higher density. Also, weight reduction can be realized.

[1.4 Modification of First Embodiment]
(First modification)
FIG. 6 is a plan view showing a configuration example of a light emitting device 100-1 according to the first modification of the first embodiment. In the light emitting device 100-1 as the first modified example, all the drive elements 40 are provided on the relay board 20. FIG. In the light emitting device 100-1, the plurality of light sources 2 provided in both of the two light source units 10 adjacent in the Y-axis direction are driven by the drive element 40 provided between the two light source units 10. It's becoming Specifically, for example, as shown in FIG. 6, the unit areas AL, AC, and AR are set so as to straddle both the light source unit 10A and the light source unit 10B. Here, for example, the plurality of light sources 2 provided in the unit area AL are connected to the drive element 40L by the wiring 4, and driven and controlled by the drive element 40L. Further, the light source 2 provided in the unit area AC is connected to the driving element 40C by the wiring 4, and is driven and controlled by the driving element 40C. Furthermore, the light source 2 provided in the unit area AR is connected to the driving element 40R by the wiring 4, and driven and controlled by the driving element 40R. Thus, in the present disclosure, it is possible to arbitrarily set the unit in which the plurality of light sources 2 are driven and controlled.

Although six light sources 2 are arranged in one unit area AL, AC, AR in the example shown in FIG. 6, the present disclosure is not limited to this. The number of light sources 2 included in one unit area AL, AC, AR may be one, two, or four or more.

<2. Second Embodiment>
[2.1 Configuration]
FIG. 7 illustrates the appearance of the display device 101 according to the second embodiment of the present technology. A display device 101 includes a light-emitting device 100 and is used, for example, as a flat-screen television device, and has a configuration in which a flat plate-like main body portion 102 for image display is supported by a stand 103 . The display device 101 is used as a stationary type by placing it on a horizontal surface such as a floor, a shelf, or a stand with the stand 103 attached to the main body 102 . It can also be used as a wall-mounted type.

FIG. 8 is an exploded view of the main body 102 shown in FIG. The main body 102 has, for example, a front exterior member (bezel) 111, a panel module 112, and a rear exterior member (rear cover) 113 in this order from the front side (viewer side). The front exterior member 111 is a frame-shaped member that covers the front peripheral edge of the panel module 112, and a pair of speakers 114 are arranged below. The panel module 112 is fixed to the front exterior member 111, and a power board 115 and a signal board 116 are mounted on the rear surface thereof, and a mounting bracket 117 is fixed. The mounting hardware 117 is for mounting a wall bracket, mounting a substrate, etc., and mounting the stand 103 . The rear exterior member 113 covers the rear and side surfaces of the panel module 112 .

FIG. 9 is an exploded view of the panel module 112 shown in FIG. The panel module 112 includes, for example, a front housing (top chassis) 121, a liquid crystal panel 122, a frame member (middle chassis) 123, a light emitting device 100, and a rear housing (back chassis) from the front side (viewer side). 124 and a timing controller board 127 in this order.

The front housing 121 is a frame-shaped metal component that covers the front periphery of the liquid crystal panel 122 . The liquid crystal panel 122 has, for example, a liquid crystal cell 122A, a source substrate 122B, and a flexible substrate 122C such as COF (Chip On Film) connecting these. The frame-shaped member 123 is a frame-shaped resin part that holds the liquid crystal panel 122 . The rear housing 124 is a metal component made of iron (Fe) or the like, which accommodates the liquid crystal panel 122 , the frame member 123 and the light emitting device 100 . A timing controller board 127 is also mounted on the rear surface of the rear housing 124 .

FIG. 10 is a schematic plan view showing a more specific configuration example of the panel module 112. FIG. In the example of the light emitting device 100 shown in FIG. 10, a total of 12 light source units 10 are arranged in an area corresponding to the display area of the liquid crystal panel 122 extending in the H direction (horizontal direction) and V direction (vertical direction). there is Specifically, six rows of the light source units 10 are arranged in the H direction, and two rows of the light source units 10 are arranged in the V direction. In each light source unit 10, for example, the longitudinal direction of the plurality of light source substrates 1 is the H direction, and the longitudinal direction of the relay substrate 20 is the V direction. Note that the illustration of the flexible film 30 is omitted in FIG. As shown in FIG. 10, in the panel module 112, the timing controller board 127 is provided, for example, in the central region of the light emitting device 100. As shown in FIG. The timing controller board 127 and the plurality of light source units 10 (10-1 to 10-12) are connected by cables CB (CB1 to CB12) and connectors CN (CN1 to CN12), respectively.

[2.2 Effects]
In the display device 101 , an image is displayed by selectively transmitting light from the light emitting device 100 through the liquid crystal panel 122 . Here, as described in the first embodiment, since the light emitting device 100 having excellent light emission controllability and improved light emission efficiency is provided, improvement in display quality of the display device 101 can be expected.

[2.3 Modification of Second Embodiment]
(First modification)
FIG. 11 is a schematic plan view showing a panel module 112A as a first modified example of the second embodiment. In the panel module 112 shown in FIG. 10, the timing controller board 127 and all the light source units 10 are individually and directly connected by cables CB and connectors CN. On the other hand, in the panel module 112A, for example, the relay substrates 20 of two light source units 10 adjacent in the V direction are electrically connected to form six light source unit pairs 10P. Specifically, light source units 10-1 to 10-6 and light source units 10-7 to 10-12 are connected to form light source unit pairs 10P1 to 10P6, respectively. The connection between the relay boards 20 can be performed by, for example, a board-to-board connector, or a flexible printed wiring board (FPC) and an anisotropic conductive adhesive (ACA). The timing controller board 127 and the six light source unit pairs 10P1-10P6 are connected by cables CB1-CB6 and connectors CN1-CN6, respectively.

According to the panel module 112A of FIG. 11, compared to the panel module 112 (FIG. 10) of the second embodiment, when using the same number of light source units 10, the number of cables CB and connectors CN can be reduced. can.

(Second modification)
FIG. 12 is a schematic plan view showing a light-emitting device 100B forming a panel module 112B as a second modification of the second embodiment. In the light emitting device 100B of the panel module 112B of this modified example, four lines of the light source units 10 are arranged in the H direction and two lines of the light source units 10 are arranged in the V direction. Furthermore, in each of the light source units 10-1 to 10-8, the longitudinal direction of the plurality of light source boards 1 is the V direction, and the longitudinal direction of the relay board 20 is the H direction. In the panel module 112B, for example, the relay boards 20 of two light source units 10 adjacent in the H direction may be electrically connected to form a total of four light source unit pairs 10P1 to 10P4. Specifically, a light source unit pair 10P1 in which the relay boards 20 of the light source units 10-1 and 10-2 are connected to each other, and a light source in which the relay boards 20 of the light source units 10-3 to 10-4 are connected to each other. A light source unit pair 10P3 formed by connecting the unit pair 10P2 and the relay boards 20 of the light source units 10-5 to 10-6, and a light source formed by connecting the relay boards 20 of the light source units 10-7 to 10-8. A unit pair 10P4 may be formed. The connection between the relay boards 20 is as described above. In the light emitting device 100B, the timing controller board 127 and the light source unit pairs 10P1 to 10P4 are connected by connectors CN1 to CN4. In the light emitting device 100B, for example, the relay boards 20 of the four light source units 10-1 to 10-4 arranged in the H direction are electrically connected, and the relay boards 20 of the four light source units 10-5 to 10-8 are electrically connected. may be electrically connected. Further, in the light emitting device 100B, the timing controller board 127 and all the light source units 10 may be individually and directly connected by cables CB and connectors CN.

(Third modification)
FIG. 13 is a schematic plan view showing a light emitting device 100C forming a panel module 112C as a third modified example of the second embodiment. In the light emitting device 100C of the panel module 112C of this modified example, six rows of the light source units 10 are arranged in the H direction and two rows of the light source units 10 are arranged in the V direction, similarly to the light emitting device 100 of the panel module 112 of FIG. I'm trying In each light source unit 10, the longitudinal direction of the plurality of light source substrates 1 is the H direction, and the longitudinal direction of the relay substrate 20 is the V direction. However, the relay board 20 is provided so as to straddle the two light source units 10 at the boundary between the two light source units 10 adjacent in the H direction. The relay board 20 provided at the boundary between two adjacent light source units 10 is shared by the two light source units 10 .

According to the panel module 11C of FIG. 13, the number of relay boards 20 can be reduced when using the same number of light source units 10 as compared with the panel module 112 (FIG. 10) of the second embodiment.

<3. Other modified examples>
Although the present disclosure has been described with reference to the embodiments and modifications, the present disclosure is not limited to the above-described embodiments and the like, and various modifications are possible. For example, the material, type, arrangement position, shape, and the like of each component of the light-emitting device described in the above embodiments are not limited to those described above.

[3.1 Modification 3-1]
FIG. 14 is a cross-sectional view showing an enlarged part of a light emitting device 100D as Modification 3-1 of the present disclosure. Although the light emitting element 21 is sealed by the sealing lens 22 in the first embodiment, the present disclosure is not limited to this. 100 A of light-emitting devices are equipped with 2 A of light sources instead of the light source 2. FIG. The light source 2A has a light emitting element 21A instead of the light emitting element 21 and a cap lens 22A instead of the sealing lens 22. As shown in FIG.

The light emitting element 21A is, for example, a packaged blue LED. Specifically, the light emitting element 21A has a light emitting layer 26, a base portion 27, and a sealing material 28. As shown in FIG. The base 27 has a recessed accommodating portion. The light-emitting layer 26 is arranged on the bottom surface of the housing portion of the base portion 27 . A housing portion of the base portion 27 is filled with a sealing material 28 . The light-emitting layer 26 is, for example, a point light source, and is specifically composed of a blue LED. The base portion 27 is mounted on the light source substrate 1 by soldering or the like via an external electrode such as a lead frame. It is preferable that the surface of the housing portion of the base portion 27 has a high reflectance with respect to the light from the light emitting layer 26 . The surface of the housing portion of the base 27 may contain, for example, Ag as a highly reflective material. The encapsulant 28 is made of transparent resin such as silicone or acryl. The cap lens 22A is spaced apart from the light emitting element 21A and arranged directly above the light emitting element 21A. At the center position of the cap lens 22A, an incident surface 22A1 having a concave shape facing the light emitting element 21A is provided so as to face the light emitting element 21A in the Z-axis direction. In addition, the cap lens 22A has an exit surface 22A2 that faces the diffusion sheet 7 and has, for example, a convex shape. The incident surface 22A1 and the exit surface 22A2 respectively exert a diffusing action on the blue light LB from the light emitting element 21A.

In the light emitting device 100A having such a configuration, the blue light emitted from the light emitting element 21A is diffused by the cap lens 22A and the diffusion sheet 7, and then converted from blue light to white light when passing through the wavelength conversion sheet 8. The Rukoto. The white light converted from the blue light is further improved in brightness and made uniform by the optical sheet group 9, and is irradiated to a liquid crystal display panel or the like.

[3.2 Modification 3-2]
In the light-emitting device 100D as the modified example 3-1, the packaged blue LED is used as the light-emitting element 21A, but the present disclosure is not limited to this. For example, like the light-emitting element 21B of the light-emitting device 100E as Modification 3-2 of the present disclosure shown in FIG. 15, a packaged white LED may be employed instead of the packaged blue LED. The light-emitting element 21B has a light-emitting layer 26 made of, for example, a blue LED, a base portion 27, and a sealing material 29 made of a transparent resin containing a wavelength conversion substance. Note that the wavelength conversion sheet 8 is not required in the light emitting device 100E. Therefore, compared with the light-emitting device 100D of FIG. 14, it is advantageous for thinning the overall configuration.

[3.3 Modification 3-3]
Further, the light-emitting device of the present disclosure is not limited to arranging a lens on the emission side of the light-emitting element. For example, like a light-emitting device 100F as a modified example 3-3 of the present disclosure shown in FIG. 16, a plurality of light-emitting elements 21C, which are packaged blue LEDs, for example, may be arranged without providing various lenses. The light-emitting element 21C has substantially the same configuration as the light-emitting element 21A shown in FIG. In the light-emitting device 100F having such a configuration, the blue light emitted from the light-emitting element 21C is diffused by the diffusion sheet 7 and then converted from blue light to white light when passing through the wavelength conversion sheet 8. . The white light converted from the blue light is further improved in brightness and made uniform by the optical sheet group 9, and is irradiated to a liquid crystal display panel or the like.

[3.4 Modification 3-4]
In the light-emitting device 100F as Modification 3-3, the packaged blue LED is used as the light-emitting element 21C, but the present disclosure is not limited to this. For example, a packaged white LED may be employed instead of a packaged blue LED, like a light emitting element 21D of a light emitting device 100G as Modified Example 3-4 of the present disclosure shown in FIG. The light-emitting element 21D has substantially the same configuration as the light-emitting element 21B shown in FIG. 11, and is composed of, for example, a light-emitting layer 26 composed of a blue LED, a base portion 27, and a transparent resin containing a wavelength conversion substance. and a sealing material 29 . The wavelength conversion sheet 8 is not required in the light emitting device 100G. Therefore, compared with the light-emitting device 100F of FIG. 16, it is advantageous in reducing the thickness of the overall structure.

[3.5 Modification 3-5]
A light-emitting device 100H as Modification 3-5 of the present disclosure shown in FIG. The configuration of the light emitting element 21E is substantially the same as the configuration of the light emitting element 21C, except that the shape of the sealing material 28 is different. In the light-emitting element 21E, the sealing member 28 has a dome shape, so that the sealing member 28 can act as a lens. Therefore, desired alignment performance can be easily obtained.

[3.6 Modification 3-6]
A light-emitting device 100I as Modified Example 3-6 of the present disclosure shown in FIG. The configuration of the light emitting element 21F is substantially the same as the configuration of the light emitting element 21D, except that the shape of the sealing material 28 is different. Specifically, the light-emitting element 21F has a light-emitting layer 26 made of, for example, a blue LED, a base portion 27, and a sealing material 29 made of a transparent resin containing a wavelength conversion substance. In the light-emitting element 21F, the sealing member 29 has a dome shape, so that the sealing member 29 can act as a lens. Therefore, desired alignment performance can be easily obtained.

[3.7 Modification 3-7]
FIG. 20 shows a cross-sectional configuration of a light-emitting device 100J as Modification 3-7 of the present disclosure, and corresponds to FIG. 3 showing the light-emitting device 100 of the first embodiment. In the light emitting device 100J, the insulating layer 1Z is formed on the back surface 1BS of the light source substrate 1, and the insulating layer 20Z is formed on the surface of the relay substrate 20 as well. Further, in the light emitting device 100H, the back surface 1BS of the light source substrate 1 and the front surface of the relay substrate 20 are directly or indirectly bonded by the adhesive layer AD. In the light-emitting device 100H, for example, an anisotropic conductive adhesive is preferably used as the constituent material of the conductive material layer 54 . Furthermore, the adhesive layer AD can also be made of an anisotropic conductive adhesive like the conductive material layer 54 . In that case, the adhesive layer AD and the conductive material layer 54 can be formed simultaneously using the same anisotropic conductive adhesive. The anisotropic conductive adhesive is an insulating adhesive in which a plurality of conductive particles are dispersed. Therefore, in the anisotropic conductive adhesive sandwiched between the wiring 51 and the wiring 52 and pressed, the plurality of conductive particles are electrically connected to form the conductive material layer 54 . On the other hand, the anisotropic conductive adhesive in the region other than the region sandwiched between the wiring 51 and the wiring 52 constitutes an adhesive layer AD exhibiting insulation. Note that the insulating layer 1Z and the insulating layer 20Z may not be provided in the light emitting device 100H.

FIG. 21 is a cross-sectional view showing the detailed configuration of the conductive material layer 54 of the light emitting device 100J. As shown in FIG. 21, the conductive material layer 54 has bumps 61 , bumps 62 and conductive material 63 . The bump 61 is provided on the wiring 51 . The bump 62 is provided on the wiring 52 . Conductive material 63 is sandwiched between

bumps

61 and 62 . As the constituent material of the bump 61, the constituent material of the bump 62, and the conductive material 63, for example, conductive paste and solder containing at least one of Ag, Cu, Ni and Sn, and anisotropic conductive adhesive are suitable. Used.

22A to 22C are cross-sectional views showing the process of forming the conductive material layer 54 in the light emitting device 100H. First, as shown in FIG. 22A, the wiring 51 of the light source unit 10 and the wiring 52 of the relay board 20 are made to face each other. Next, as shown in FIG. 22B, bumps 61 are formed to cover the wirings 51 and bumps 62 are formed to cover the wirings 52 . Subsequently, as shown in FIG. 22C, an anisotropic conductive adhesive 63Z is formed to cover the bumps 61. Then, as shown in FIG. An anisotropic conductive adhesive 63Z may be formed so as to cover the bumps 62. FIG. Finally, an anisotropic conductive adhesive 63Z is pressed between the

bumps

61 and 62 to form the conductive material 63, and the light source unit 10 and the relay substrate 20 are joined. As described above, the conductive material layer 54 is formed, and the connecting portion 50 is completed.

In FIG. 21, the bumps 61 and the bumps 62 are formed on both the light source unit 10 and the relay substrate 20. Only one of the substrates 20 may be provided with bumps. In the light emitting device 100JA of FIG. 23, the bumps 61 are provided only on the wirings 51 of the light source unit 10 so that the wirings 52 of the relay substrate 20 are in direct contact with the conductive material layer 54. FIG. However, the bumps 62 may be provided only on the wirings 52 of the relay substrate 20 so that the wirings 51 of the light source unit 10 are in direct contact with the conductive material layer 54 . In FIG. 23, the depth D20Z is the difference in the Z-axis direction between the upper surface of the insulating layer 20Z and the upper surface of the wiring 52. In FIG. The upper surface of the insulating layer 20Z refers to the surface of the insulating layer 20Z that faces the insulating layer 1Z. The upper surface of the wiring 52 refers to the surface of the wiring 52 that faces the bump 61 . In FIG. 23, height H61 is the difference in the Z-axis direction between the position (tip) of the lower surface of the bump 61 that is closest to the upper surface of the wiring 52 and the lower surface of the insulating layer 1Z. The lower surface of the bump 61 refers to the surface of the bump 61 facing the wiring 52 . The lower surface of the insulating layer 1Z refers to the surface of the insulating layer 1Z that faces the insulating layer 20Z. Furthermore, the height H63 is the thickness of the portion of the conductive material 63 sandwiched between the tip of the bump 61 and the upper surface of the wiring 52 . Let height H54 be the sum of height H61 and height H63. In the light emitting device 100JA of FIG. 23, it is desirable that the height H54 is larger than the depth D20Z (H54>D20Z). This is for obtaining sufficient conductivity in the conductive material 63 .

As described above, in light emitting device 100JA in which bumps are provided only on one of light source unit 10 and relay substrate 20, light emitting device 100J in which bumps are formed on both light source unit 10 and relay substrate 20 is used. , the distance in the thickness direction (Z-axis direction) between the light source substrate 1 of the light source unit 10 and the relay substrate 20 can be shortened. Therefore, the thickness of the light emitting device 100JA is made thinner than the thickness of the light emitting device 100J. In addition, since the step of forming the bumps 62 can be omitted in the light emitting device 100JA, the manufacturing process can be simplified as compared with the light emitting device 100H.

24A to 24C are cross-sectional views showing the process of forming the connecting portion 50 of the light emitting device 100JA. First, as shown in FIG. 24A, the wiring 51 of the light source unit 10 and the wiring 52 of the relay board 20 are made to face each other. Next, as shown in FIG. 24B, bumps 61 are formed to cover the wirings 51 . Subsequently, as shown in FIG. 24C, an anisotropic conductive adhesive 63Z is formed to cover the bumps 61. Then, as shown in FIG. Finally, the light source unit 10 and the relay board 20 are joined by pressing so that the anisotropic conductive adhesive 63Z is sandwiched between the

bumps

61 and 62 . As described above, the conductive material layer 54 is formed, and the connecting portion 50 is completed.

Here, as can be seen from a comparison of the light emitting device 100J shown in FIG. 21 and the light emitting device 100JA shown in FIG. The dimensions can be larger for light emitting device 100JA than for light emitting device 100J. In the light emitting device 100J shown in FIG. 21, both the surface of the bump 61 and the surface of the bump 62 are convex. Therefore, in forming the conductive material 63, the conductive particles contained in the anisotropic conductive adhesive 63Z pressed between the

bumps

61 and 62 are removed from the region between the

bumps

61 and 62. Easy to flow out. On the other hand, in the light-emitting device 100JA shown in FIG. 23, although the surface of the bump 61 is convex, the upper surface of the wiring 52 facing the bump 61 is flat. For this reason, the conductive particles contained in the anisotropic conductive adhesive 63Z pressed between the bump 61 and the upper surface of the wiring 52 relatively flow out from the region between the bump 61 and the upper surface of the wiring 52 to the outside. hard to do. The same applies to the Y-axis direction.

The wiring 51 is provided in the light emitting device 100JA of FIG. can be The bumps 64 are provided so as to fill the via holes 10VH penetrating the light source substrate 1 and protrude from the rear surface 1BS of the light source substrate 1 toward the relay substrate 20 . By doing so, the configuration of the light-emitting device 100JB is simpler and thinner than that of the light-emitting device 100JA.

Further, as shown in FIG. 26, in both the light emitting device 100JA and the light emitting device 100JB, the dimension 61X in the X-axis direction and the dimension 61Y in the Y-axis direction of the bump 61 correspond to the X-axis It is preferably smaller than the directional dimension 52X and the Y dimension 52Y. FIG. 26 is a schematic plan view schematically showing an example of the positional relationship between the bump 61 and the exposed portion of the wiring 52 in the XY plane. In the light-emitting device 100JA and the light-emitting device 100JB, for example, the dimension 52X is preferably 1.5 to 3 times the dimension 61X, and the dimension 52Y is preferably 1.5 to 3 times the dimension 61Y. By making the dimensions of the bumps 61 in the XY plane smaller than the dimensions of the exposed portions of the wirings 52 in the XY plane, alignment of the light source unit 10 and the relay substrate 20 in the XY plane is facilitated. Margin can be secured. Note that although FIG. 26 illustrates a case where the

dimensions

52X and 52Y are substantially equal to each other and the

dimensions

61X and 61Y are substantially equal to each other, the present disclosure is not limited to this. That is, the planar shape of the bump 61 and the planar shape of the exposed portion of the wiring 52 are not limited to a substantially square shape, and may be a substantially rectangular shape. Alternatively, the planar shape thereof may be a rectangular shape with rounded corners, a substantially circular shape, or a substantially elliptical shape.

Note that in the light emitting devices 100JA and 100JB, the ratio of the dimension 52X to the dimension 61X depends on the arrangement density of the plurality of connection parts 50 in the XY plane (the number of connection parts 50 per unit area) and the arrangement position of the connection parts 50. and the ratio of dimension 52Y to dimension 61Y may be changed. For example, among the light emitting regions along the XY plane of the light emitting devices 100JA and 100JB, in a region with a relatively low arrangement density of the connection portions 50, compared to a region with a relatively high arrangement density of the connection portions 50, The ratio of dimension 52X and the ratio of dimension 52Y to dimension 61Y may be increased. Alternatively, the ratio of the dimension 52X to the dimension 61X and the ratio of the dimension 52Y to the dimension 61Y are made relatively small in the connection portion 50 located near the center position of the relay board 20 in the Y-axis direction. At the connecting portions 50 located near the ends, the ratio of the dimension 52X to the dimension 61X and the ratio of the dimension 52Y to the dimension 61Y may be relatively large.

[3.8 Modification 3-8]
FIG. 27 shows a cross-sectional configuration of a light emitting device 100K as Modification 3-8 of the present disclosure, and corresponds to FIG. 3 showing the light emitting device 100 of the first embodiment. In the light emitting device 100K, the insulating layer 1Z is formed on the back surface 1BS of the light source substrate 1, and the insulating layer 20Z is formed on the surface of the relay substrate 20 as well. In the light-emitting device 100K, conductive paste and solder containing Ag or Cu, for example, are preferably used as the constituent material of the conductive material layer 54 .

[3.9 Modification 3-9]
Although the display device 101 including the liquid crystal panel 122 has been described as an example in the second embodiment, the present disclosure is not limited to this. That is, in the display device 101, the light emitting device 100 is used as the backlight of the liquid crystal panel 122, but the light emitting device 100 may be used as the display panel.

FIG. 28 schematically shows a display device 201 having a display panel 200. FIG. The display device 201 includes a display panel 210 and a control circuit 220 that drives and controls the display panel 210 . The display device 201 is a so-called LED display, and uses LEDs as display pixels. That is, the light source 2 of the light emitting device 100 is used as a display pixel. The display panel 210 is formed by stacking a mounting substrate 210A including the light emitting device 100 and a counter substrate 210B. The surface of the counter substrate 210B (the surface opposite to the mounting substrate 210A) serves as an image display surface, and has a display area in the center and a frame area as a non-display area around it. The counter substrate 210B is arranged, for example, at a position facing the mounting substrate 210A with a predetermined gap therebetween. Note that the counter substrate 210B may be in contact with the upper surface of the mounting substrate 210A. The counter substrate 210B has, for example, a light-transmitting substrate that transmits visible light, such as a glass substrate, a transparent resin substrate, or a transparent resin film.

Also, the effects described in this specification are merely examples and are not limited to the descriptions, and other effects may be provided. For example, the light source is not limited to either a white light source or a blue light source, but may be a light source that emits other colors such as a red light source or a green light source. Further, in the light emitting device 100 and the like, the flexible film 30 is attached to the light emitting surface side of each light source unit 10, and the plurality of light source units 10 are fixed to the flexible film 30. A flexible film 30 may be attached to the back surface opposite to the light emitting surface of the . Furthermore, the present technology can take the following configurations.
(1)
a plurality of light source units each having a light source substrate extending in a first direction and a plurality of light sources arranged along the first direction on the light source substrate;
A light emitting device comprising: a relay member electrically connected to each of the plurality of light source units.
(2)
The light emitting device according to (1) above, wherein the plurality of light source units and the relay member are joined via a conductive material.
(3)
The light emitting device according to (1) or (2) above, wherein the plurality of light source units are spaced apart from each other and arranged along a second direction orthogonal to the first direction.
(4)
The light emitting device according to (3), wherein the width of the light source unit in the second direction is narrower than the interval between the plurality of light source units adjacent to each other in the second direction.
(5)
The light emitting device according to (4) above, wherein the plurality of light sources are arranged in a row along the first direction on the light source substrate.
(6)
The light source substrate has flexibility,
Or The light-emitting device according to any one of (1) to (5) above, wherein both the light source substrate and the relay member are flexible.
(7)
The light emitting device according to any one of (1) to (6) above, further comprising a flexible sheet member to which the plurality of light source units are fixed.
(8)
The light emitting device according to (7), wherein the sheet member is joined to a surface of the light source unit along the first direction.
(9)
The light emitting device according to (7) or (8) above, wherein the sheet member has an opening in a region overlapping with the light source in a third direction orthogonal to the first direction.
(10)
The light emitting device according to any one of (1) to (9) above, further comprising a drive element that drives the plurality of light sources.
(11)
The light emitting device according to (10), wherein the drive element is provided on at least one of the relay member and the light source substrate.
(12)
The light-emitting device according to (10) above, wherein the drive element is provided on the light source substrate and drives a part of the plurality of light sources provided on the light source substrate.
(13)
The drive element is provided on the relay member, and is used to drive a first light source in a first light source unit among the plurality of light source units and a second light source in a second light source unit among the plurality of light source units. The light-emitting device according to (10) above, which is adapted to drive both.
(14)
The light emitting device according to any one of (1) to (13) above, wherein the plurality of light source units and the relay member are respectively joined at a plurality of locations.
(15)
The light emitting device according to any one of (1) to (14) above, wherein each of the plurality of light sources is a white light source, or includes a red light source, a green light source, and a blue light source.
(16)
further comprising a wavelength conversion member;
the light source is a blue light source,
The light-emitting device according to any one of (1) to (14) above, wherein the wavelength conversion member converts blue light from the blue light source into white light.
(17)
The light-emitting device according to (16) above, wherein the wavelength conversion member includes a quantum dot.
(18)
a light emitting device;
a display panel that displays an image using light from the light emitting device,
The light emitting device
a plurality of light source units each having a light source substrate extending in a first direction and a plurality of light sources arranged along the first direction on the light source substrate;
A display device comprising: a relay member electrically connected to each of the plurality of light source units.
(19)
a plurality of light source units each having a light source substrate extending in a first direction and a plurality of light sources arranged along the first direction on the light source substrate;
and a flexible sheet member to which the plurality of light source units are fixed.
(20)
further comprising a plurality of connecting portions for electrically connecting the plurality of light source units and the relay member, respectively;
The plurality of light source units and the relay member overlap each other in the thickness direction of the light source substrate at the plurality of connection portions,
The connecting portion includes a first bump formed on the light source unit, a second bump formed on the relay member and facing the first bump in the thickness direction, the first bump and the second bump. The light-emitting device according to any one of the above (1) to (18), further comprising a conductive material sandwiched between and.
(21)
further comprising a plurality of connecting portions for electrically connecting the plurality of light source units and the relay member, respectively;
The plurality of light source units and the relay member overlap each other in the thickness direction of the light source substrate at the plurality of connection portions,
The connection portion includes a bump formed on one of the light source unit and the relay member, a pad formed on the other of the light source unit and the relay member and facing the bump in the thickness direction, The light-emitting device according to any one of (1) to (18) above, including a conductive material sandwiched between the bump and the pad.
(22)
The light emitting device according to (21) above, wherein each of the plurality of light source units further includes conductive vias that are connected to the plurality of light sources and penetrate the light source substrate in the thickness direction of the light source substrate.
(23)
The light emitting device according to (22) above, wherein the bump is provided to cover the conductive via.
(24)
the dimension of the bump in the first direction is smaller than the dimension of the pad in the first direction;
The light emitting device according to (21), wherein the dimension of the bump in a second direction perpendicular to the first direction is smaller than the dimension of the pad in the second direction.
(25)
further comprising a plurality of connecting portions for electrically connecting the plurality of light source units and the relay member, respectively;
The plurality of light source units and the relay member overlap each other in the thickness direction of the light source substrate at the plurality of connection portions,
The connection portion includes a bump formed on one of the light source unit and the relay member, a pad formed on the other of the light source unit and the relay member and facing the bump in the thickness direction, The display device according to (18) above, further comprising a conductive material interposed between the bump and the pad.

This application is based on Japanese Patent Application No. 2022-032438 filed on March 3, 2022 at the Japan Patent Office and Japanese Patent Application No. 2022-075412 filed on April 28, 2022. Priority is claimed and the entire contents of this application are incorporated into this application by reference.

Depending on design requirements and other factors, those skilled in the art may conceive various modifications, combinations, subcombinations, and modifications that fall within the scope of the appended claims and their equivalents. It is understood that

Claims

a plurality of light source units each having a light source substrate extending in a first direction and a plurality of light sources arranged along the first direction on the light source substrate;
A light emitting device comprising: a relay member electrically connected to each of the plurality of light source units.
The light emitting device according to claim 1, wherein the plurality of light source units and the relay member are joined via a conductive material.
The light-emitting device according to claim 1, wherein the plurality of light source units are spaced apart from each other and arranged along a second direction orthogonal to the first direction.
The light emitting device according to claim 3, wherein the width of the light source unit in the second direction is narrower than the interval between the plurality of light source units adjacent to each other in the second direction.
The light emitting device according to claim 4, wherein the plurality of light sources are arranged in a line along the first direction on the light source substrate.
The light source substrate has flexibility,
Or The light-emitting device according to claim 1, wherein both the light source substrate and the relay member are flexible.
The light emitting device according to claim 1, further comprising a flexible sheet member to which the plurality of light source units are fixed.
The light emitting device according to claim 7, wherein the sheet member is joined to a surface of the light source unit along the first direction.
The light emitting device according to claim 7, wherein the sheet member has an opening in a region overlapping with the light source in a third direction orthogonal to the first direction.
The light emitting device according to claim 1, further comprising a driving element that drives the plurality of light sources.
The light emitting device according to claim 10, wherein the drive element is provided on at least one of the relay member and the light source substrate.
11. The light emitting device according to claim 10, wherein the driving element is provided on the light source substrate and drives some of the plurality of light sources provided on the light source substrate.
The drive element is provided on the relay member, and is used to drive a first light source in a first light source unit among the plurality of light source units and a second light source in a second light source unit among the plurality of light source units. 11. The light emitting device according to claim 10, adapted to drive both.
The light emitting device according to claim 1, wherein the plurality of light source units and the relay member are joined at a plurality of locations.
The light emitting device according to claim 1, wherein the plurality of light sources are all white light sources or include a red light source, a green light source and a blue light source.
further comprising a wavelength conversion member;
the light source is a blue light source,
The light emitting device according to claim 1, wherein the wavelength conversion member converts blue light from the blue light source into white light.
The light emitting device according to claim 16, wherein the wavelength conversion member includes quantum dots.
a light emitting device;
a display panel having a display area for displaying an image using light from the light emitting device,
The light emitting device
a plurality of light source units each having a light source substrate extending in a first direction and a plurality of light sources arranged along the first direction on the light source substrate;
A display device comprising: a relay member electrically connected to each of the plurality of light source units.
a plurality of light source units each having a light source substrate extending in a first direction and a plurality of light sources arranged along the first direction on the light source substrate;
and a flexible sheet member to which the plurality of light source units are fixed.
further comprising a plurality of connecting portions for electrically connecting the plurality of light source units and the relay member, respectively;
The plurality of light source units and the relay member overlap each other in the thickness direction of the light source substrate at the plurality of connection portions,
The connecting portion includes a first bump formed on the light source unit, a second bump formed on the relay member and facing the first bump in the thickness direction, the first bump and the second bump. The light emitting device of claim 1, comprising a conductive material sandwiched between and.
further comprising a plurality of connecting portions for electrically connecting the plurality of light source units and the relay member, respectively;
The plurality of light source units and the relay member overlap each other in the thickness direction of the light source substrate at the plurality of connection portions,
The connection portion includes a bump formed on one of the light source unit and the relay member, a pad formed on the other of the light source unit and the relay member and facing the bump in the thickness direction, 2. A light emitting device according to claim 1, comprising a conductive material sandwiched between a bump and said pad.
22. The light emitting device according to claim 21, wherein each of said plurality of light source units further includes conductive vias that are connected to said plurality of light sources and penetrate said light source substrate in the thickness direction of said light source substrate.
23. The light emitting device according to claim 22, wherein the bump is provided to cover the conductive via.
the dimension of the bump in the first direction is smaller than the dimension of the pad in the first direction;
22. The light emitting device according to claim 21, wherein the dimension of said bump in a second direction orthogonal to said first direction is smaller than the dimension of said pad in said second direction.
further comprising a plurality of connecting portions for electrically connecting the plurality of light source units and the relay member, respectively;
The plurality of light source units and the relay member overlap each other in the thickness direction of the light source substrate at the plurality of connection portions,
The connection portion includes a bump formed on one of the light source unit and the relay member, a pad formed on the other of the light source unit and the relay member and facing the bump in the thickness direction, 19. The display device of claim 18, comprising a bump and a conductive material sandwiched between said pad.